Our Earth is in continuous motion. In fact, it has two different motions. It rotates on its own axis and also travels around the Sun. The motion of Earth on its own axis is known as its rotation and it takes about 24 hours. Earth's motion around the Sun is known as its revolution and it takes about 365.25 days.
Our Earth travels around the Sun in a slightly elliptical orbit and takes 365.25 days to complete one revolution around the Sun. It is this motion around the Sun, in addition to Earth's rotation and its tilt, that is responsible for seasons on Earth. It is also the reason why the Northern and Southern hemispheres experience contrasting weathers at the same time (summer in the Northern hemisphere and winter in the Southern hemisphere at the same time).
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